Shuttle bobbin and method of making the same



Nw., 5, w35 C. E. CHAFFIN y www SHUTTLE BOBBIN AND METHOD OF MAKING THESAME Filed April 10,' 1954 INVENTOR, .fezfem ATTORNEY.

Patented Nov. 5, 1935 l' UNITED STATES SHUTTLE BOBBIN METHOD F MAKING THESAME Clarence E. Challin, Sprinsleld, Mass.

Application April 10, 1934, Serial N0. 719,944

This invention relates to improvements in shuttle bobbins, and themethod of making the same.

By the term shuttle bobbin, it is to be under- 5 stood as referring tothe wound spools of thread that are used in the 'shuttle of a sewingmachine, usually of the rotary shuttle type, or of the oscillating type.

An object of., the present invention is to provide l0 a shuttle bobbinthat is constructed entirely of paper, thus lessening the expense of thearticle and improving it in other ways.

A further object is to provide a shuttle bobbin, in which thedisc-shaped paper ends are formed with reinforcing ribs, or spokelikeconstruction,

for providing a. frictional resistance in the shuttle of the machine,when idling, and also to lessen, or prevent, back lash.

A further object is to provide the ends of the shuttle bobbin with adouble thickness of paper, for the purpose of providing. stiffer andstronger side walls, whereby the two ends will hold, or retain theirshape very much better.

A further object is in the manner of attaching the ends, or discs, tothe paper core, by means of glue-covered tabs which are an integral party of one of the layers of the disc and are located, or projected, intothe opposite ends of the paper core and before the moisture on theglue-covered tabs has had time to dry, after -being moistened by anysuitable means. Y A

A further feature of my invention is in using the two layers, or strips,of paper, for building up the end discs, one having glue, or otheradhesive substance on one surface and the other strip without anyadhesive on either of its sur- 4 faces. The two strips, one of which isprovided with spaced openings, are then attached, or secured, to eachother, after first moistening the glue-covered strip. A suitable punchis next moved against the gummed strip, and through an opening on theplain strip, to pierce the gummed strip and at the same time, form aplurality of gummed tabs, which tabs are then, while still moist, movedagainst the inner surface of the paper core with this punch, or tool.The result of this operation is to quickly and rmly secure the end discsof paper, having a double thickness, to the ends of the paper core. Thisoperation on the shuttle bobbin prevents any of the glue from cominginto direct contact with the wound thread on the core: it beingunderstood that the core has 'first been wound before the end discs ofpaper are attached thereto.

A further object of the ribbed discs is to prevent the possible spillingof the threadinside of the shuttle bobbins case, when the thread isbeing used, or drawn off from the bobbin. The ribs, or spokelikestructure of the discs also provide spaces, or recesses, on their innersurfaces, 5

into which the mass of vthread is moved, after the end discs have beenattached to the opposite ends of the cor'e, when pressure is applied tothe attached discs, by means of dies having depressions therein. Thislast operation serves to produce l@ a shuttle spool -of the desiredlength, or thickness. Another feature of the ribbed, or stiffened discs,is to cause them to always remain at .right angles to the axis of thecore.

The invention, briefly, is to first wind the 15 thread on a paper, orother core, with the mass of thread terminating near the opposite endsof the core; next, securing together the two strips of paper, one ofwhich is gummed, and the other is provided with spaced openings; next',forming 20 discs out of the two layers of paper, then forming tabs inthe gummed strip of the disc and projecting and pressing the tabs intothe opposite ends of the core for securing, or attaching, the discs tothe ends of the core and, next, forming the a ribs or spokelike surfaceson the two end discs, by compressing the mass of thread and the core,

in order to produce a nished article of the right. dimensions, as willbe fully described.

Referring to the drawing: 30

Fig. 1 is an end view of the nished shuttle bobbin, showing the ribs, orspokelike structure, onV one of the end discs.

Fig. 2 is a side view of Fig. 1.

Fig. 3 is an enlarged, detail, sectional view of 35 the nished shuttlebobbin, showing the gummed means for securing the end discs to the core.

'Fig. 4 indicates a strip of ungummed paper ,formed with the equallyspaced openings.

Fig. 5 is a strip of paper that is gummed on 40 one of its surfaces.

Fig. 6 illustrates the two paper strips, showny in Figs. 4 and 5, afterbeing secured together with the adhesive, which shows through the 45openings in the ungummed strip.

Fig. '1 illustrates the openings in two strips of paper, after severalof the end discs have been punched, or removed therefrom.

Fig. 8 shows one of the two ply paper discs 50 with the adhesive on onedisc showing through the opening of the ungummed disc.

Fig. 9 is an enlarged, sectional view on the line 9-9 of Fig. 8, showingthe adhesive between the two layers.

Fig. 10 shows the gummed strip, after being slitted to form the tabs.

Fig. 11 shows the gummed tabs projected through the opening of theungummed disc.

Fig. 12 is a View, showing the implement, or punch, in position forslitting the gummed strip, after one of the discs, shown in Figs. 8 and10, have been placed on the end of the wound core.

Fig. 13 shows the punch, after slitting the gummed strip to form thetabs and moving the gummed tabs into the end of the core for securingthe disc to the core, and

Fig. 14 shows the two dies for forming the radial ribs, or spokelikestructure in the discs, and for compressing the mass of wound thread, inorder to produce a finished article of the 4correct size, or length.

Referring to the drawing in detaik- I indicates the finished shuttlebobbin having the wound thread 2, known in the art as universal-winding.The oppositely located end pieces, or discs, are indicated at 3 and 4,which are formed with the raised, radial ribs, or spokelike elevations5, and raised circular part 5", it being understood that both of thediscs 3 and 4 are formed with these ribs, or spokelike elevations andthe raised, circular portion 5".

Referring now to the detail construction cf the discs 3 and 4, both ofwhich are alike, these discs are formed with two thicknesses, or layers,of paper, and are built up, or made, as follows: 5 indicates a strip ofungummed, or plain paper, of suitable quality having the equally spacedcircular openings 6 along its center line. 1 indicates a strip of paperof the same width as 5 having applied to one of its surfaces the glue,or adhesive, indicated at 8. Suitable means is provided for moisteningthe adhesive and then the f two strips are secured together by suitablemech,-

anism, not shown, for producing the article, shown in Fig. 6, whichcomprises a strip of paper of double thickness. 'I'his built-up strip isthen subjected to a punching process which cuts out, or removes thediscs 9, shown in Fig. 8, and an enlarged view in Fig. 9. The openingsI0 in Fig. 7 indicate the removal of the discs 8. Next, one of thediscs, shown in Fig. 8, is placed on the wound core I2, as shown in Fig.12, against the thread 2. A suitable punch, or tool I2', having thesharp edges I2", is passed through the openings 6 for engaging thereverse, or ungummed, side of the gummed surface 8 of the strip T, asshown in Fig. 12, in order to slit the same to form the tabs I I, fourof which are shown in Fig. 10. The tool I2', of the arrow, not onlyforms the tabs II, but moves them into the inside of the core I2, andforces them into clos'e contact with the inner surface of the core, sothat they can adhere thereto, as shown, in Fig. 13. In Fig. 11, thegummed tabs II are shown projected above the inner surface of the disc9, as indicating their position, when inserted in the ends of the coreI2. tached to the opposite ends of the core and thread, the two diemembers I3 and I4, preferably heated, having the circular projections I5and I6, and depressions I'I, circular depressions 5" and inclinedsurfaces I8, are moved in opposite directions, as shown by the arrows I9and 20, in Fig. 14, towards the opposite ends of the mass of woundthread 2. The projections I5 and I6 will enter the opposite ends of thecore and engage the gummed tabs II. 'I'he die members I3 and I4 operateto compress the mass when moved in the direction After the two end discshave been atof wound thread, 2, to form the finished shuttle bobbin ofFig. 2, of the desired length. The thread, at the ends of the core, isalso moved into the depressions, into the ribs, or spokelike portions 5and circular portion 5". This construction lessens, or retards, orlargely overcomes, the back lash, when the shuttle bobbin is in use. Theinclined surfaces I8 of the die members I3 and I4 will forn theinclined, inwardly bent edges 2I of the nished discs. The adhesive 1,between the two layers of the end discs. serves to materially strengthenthe end discs and assists in retaining their permanent shape.

It should be observed that the integral, annular, gummed portion 22,(see Figs. 3 and 11) of the gummed strip 1, which is formed by spacingthe points at the bottoms of the recesses between the V-shaped tabs I I,from the plane of the inner surface of the disc 9, will serve tomaterially strengthen the discs 3 and 4 and the ends of the core I2. Asshown, the length of this annular, integral portion 22 is substantially,but not necessarily, equal to the length of the V-shaped tabs I I.

It is to be understood that I do not limit myself to the use of paperexclusively, as I may, if desirable, use other suitable material.

It should be stated that I do not confine myself to the idea ofattaching, or securing, one end disc at a time to the core, asdescribed, but I may, if desired, attach both of the discs at the sametime.

What I claim is:-

l. A shuttle bobbin comprising, a paper core member and end discscomposed of flexible material and having a plurality of plies, one ofthe plies of each of the discs having an opening and the other aplurality of gummed tabs projecting through the opening and locatedwithin the core.

2. The method of producing a shuttle bobbin having a core and end discswhich consists in rst winding the thread on its core, then forming discmembers each with two layers of flexible material, one of the layershaving an opening, the other layer having an adhesive thereon forsecuring the two layers together, then, forming tabs in the adhesivelayer at the opening in said layer,

then, placing one of the discs on each end of the core, then, passing animplement through the openings in the discs for forming and moving thegummed tabs against the inner surface of the core, whereby the discs arepermanently secured to the core, then, subjecting the wound thread onthe core for compressing to the desired thickness.

3. A method for forming discs of paper which consists in providing twostrips of paper one having an adhesive on one of its surfaces and theother without any adhesive thereon but with spaced openings therein,then, moistening the gummed strip and securing the ungummed stripthereto, then cutting discs from the combined strips, then forming tabsin the gummed portion of said discs where they are exposed through theopenings in the ungummed portion.

4. A shuttle bobbin comprising, a core member, end discs composed of aplurality of layers of paper one of the layers having gummed tabs whichare located in the ends of the core and which serve to retain the layerson the ends of the core, said discs having elevations and depressionstherein.

5. As a-n article of manufacture, an end piece 0r disc for shuttlebobbins, said disc being composed of two layers of paper one of thelayers having an opening, the other layer having an 75 adhesive on oneof its surfaces, V-shaped tabs formed in the layer having the adhesiveand which tabs project beyond the inner surface of the non-adhesivelayer, the bottoms of the recesses between the V-shaped tabs'terminating at points that are spaced from the piane of the innersurface of the disc whereby, an annular strip of strengthening materialis formed.

6. As an article of manufacture, a disc mem? ber composed of layers ofpaper which are coextensive with each other and with an adhesivetherebetween, one of the layers having an opening and the other aplurality of gummed tabs.

7. The method of producing a shuttle bobbin having a core and end discs,which consists in rst winding the thread on its core, then forming discmembers each with two layers of exible ma.- terial, one of the layershaving an opening, the other layer having an adhesive thereon forsecuring the two layers together, then placing one of the disc memberson each end of the core, then, passing an implement through theopenings, in the discs, for forming and moving gummed tabs against theinner surface of the core, whereby the discs are permanently securedtothe core.

8. Steps in the method for forming a unitary disc of paper whichconsists in-providing strips of paper one having an adhesive on one ofits surfaces and another without any adhesive thereon but with spacedopenings therein, then, mois- 5 tening the gummed strip for securing theungummed strip thereto, then forming a disc from the combined strips,then, forming tabs in the gummed portion of said disc where it isexposed through the opening in the ungummed portion of said disc.

9. A shuttle bobbin comprising, a core member and end discs secured tothe core, the discs having tabs with adhesive thereon which enter thecore for securing the discs to the core and an adhesive ring portionformed as an integral part of the tabs that engages the ends of the corefor strengthening purposes.

10. As an article of manufacture, a disc member composed of a pluralityof flat co-extensive layers of paper with an adhesivetherebetween,

one of the said at layers of paper having an opening and another havinga plurality of gummed tabs projecting through the opening.

CLAREN CE E. CHAFFIN.

